of a new law in russia that bars american citizens from adopting russian children. president vladimir putin has signed the law, which places new strains on bilateral relations. >> the new law comes in response to american legislation that withholds visas to russians accused of human rights violations and freezes their u.s. assets. >> most bills signed by president putin have not been subjected to so much public scrutiny, but the ban on americans adopting russian children is controversial, so putin's strategy is to appeal to russian patriotism. >> as far as i know from opinion polls, the vast majority of russian citizens have a negative opinion of foreigners adopting our children. russia can and must look after its own children. >> at the same time, a russian judge acquitted a former prison doctor. human rights activists say he is responsible for the death of a russian lawyer in 2009. the lawyer was imprisoned after accusing russian officials of the $230 million tax fraud. since his death, relations beween the u.s. and russia have increasingly soured, culminating in the adoption van -- ban.